Display Device

1. A display device, comprising: a display layer including a light emitting device, a photo-detector, and a dummy device; and a circuit layer including a pixel driving part, which is connected to the light emitting device, and a sensor driving part which is connected to the photo-detector, wherein the light emitting device and the dummy device are overlapped with the pixel driving part, wherein the light emitting device includes: a first electrode and a second electrode facing each other; and a light emitting layer interposed between the first electrode and the second electrode to emit red light, blue light, or green light, wherein each of the photo-detector and the dummy device includes: a first electrode and a second electrode facing each other; and a photo-electric converting layer interposed between the first electrode and the second electrode to convert incident light to an electrical signal, wherein the photo-detector is overlapped with the sensor driving part, wherein the first electrode of the dummy device is not connected to the sensor driving part, wherein the first electrode of the light emitting device, the first electrode of the photo-detector and the first electrode of the dummy device are disposed on a same layer.

2. The display device of claim 1, wherein the dummy device is disposed in the same layer as a layer of the photo-electric converting layer, and is floated.

3. The display device of claim 1, wherein the pixel driving part includes: a pixel driving circuit configured to drive the light emitting device, and wherein the sensor driving part includes: a sensor driving circuit configured to drive the photo-detector.

4. The display device of claim 1, wherein a plurality of unit pixel regions are provided and wherein unit pixels are disposed in the unit pixel regions, each unit pixel including the light emitting device, and the photo-detector or the dummy device, and wherein the photo-detector is disposed in a first unit pixel region of two adjacent unit pixel regions of the plurality of unit pixel regions, and the dummy device is disposed in a second unit pixel region of two adjacent unit pixel regions of the plurality of unit pixel regions.

5. The display device of claim 4, wherein the number of the photo-detectors disposed in the first unit pixel and the number of the dummy devices disposed in the second unit pixel region are the same.

6. The display device of claim 4, wherein ‘n’ number of the sensor driving parts are disposed in ‘2n’ number of unit pixel regions, which are adjacent to each other, of the plurality of unit pixel regions, and wherein the ‘n’ is a natural number.

7. The display device of claim 6, wherein the ‘n’ number of sensor driving parts are electrically connected to ‘n’ number of photo-detectors, respectively.

8. The display device of claim 4, wherein the sensor driving part is interposed between the two adjacent unit pixel regions, when viewed in a plan view.

9. The display device of claim 1, wherein the first electrode of the photo-detector is directly connected to a first electrode of another photo-detector.

10. A display device, comprising: a display layer including a light emitting device, and a first and a second photo-detector; and a circuit layer including a pixel driving part, which is connected to the light emitting device, and a sensor driving part which is connected to the photo-detectors, wherein the light emitting device includes: a first electrode and a second electrode facing each other; and a light emitting layer interposed between the first electrode and the second electrode to emit red light, blue light, or green light, wherein each of the photo-detectors includes: a first electrode and a second electrode facing each other; and a photo-electric converting layer interposed between the first electrode and the second electrode to convert incident light to an electrical signal, wherein the first electrode of the light emitting device and the first electrode of the photo-detector are disposed on a same layer, and wherein the first electrodes included in the first and second photo-detectors are connected to one pattern, and the one pattern is connected to the sensor driving part.

11. The display device of claim 10, wherein a plurality of unit pixel regions are provided and wherein ‘x’ (which is a natural number equal to or more than 1) number of light emitting devices and ‘y’ (which is a natural number equal to or more than 1) number of photo-detectors are disposed in the unit pixel regions.

12. The display device of claim 11, wherein the first photo-detector is disposed in a first unit pixel region of two adjacent unit pixel regions of the plurality of unit pixel regions, and the second photo-detector is disposed in a second unit pixel region of the two adjacent unit pixel regions, wherein the first photo-detector and the second photo-detector are electrically connected to the sensor driving part.

13. The display device of claim 12, wherein the display layer further includes: a connection part to electrically connect the first photo-detector to the second photo-detector, and wherein the connection part is electrically connected to the sensor driving part.

14. The display device of claim 11, wherein the sensor driving part is interposed between two pixel driving parts disposed in the two adjacent unit pixel regions.

15. The display device of claim 10, wherein ‘2x’ number of pixel driving parts and ‘y’ number of sensor driving parts are disposed in the two adjacent unit pixel regions of the plurality of unit pixel regions.

16. The display device of claim 15, wherein the sensor driving part is overlapped with the two adjacent unit pixel regions, when viewed in a plan view.

17. The display device of claim 10, wherein the light emitting device is connected to the pixel driving part one to one.